Electric discharge lamp device



Aug. 28, 1934. M P|RAN| 1,971,941

ELEC RIC DISCHARGE LAMP DEVIQE Filed July 10, 1933 INVENTOR Patented Aug. 28,1934 1 Q I I UNITED STATES. PATENT tori-"loaf 1,971,941 7 sLsc'rmc mscnlmos mmrpavrcs Application July 10, 1933, Serial No. 879,785

Germany July 22, 1932 1 Claim. (01, re-m) The present invention relates to electric disfilter and the opal glass is not critical, that is the 1 charge lamp devices generally and more particuyellow filter is placed between the eye the ob- I larlythe invention relates to such devices useful server and the opal glass, or vice versa, as desired. in producing yellow colored light. Thus a typical yellow light having a low green Electric discharge lamp devices having gaseous content and which differs sharply from the fillings consisting of helium or a mixture of heliorange yellow light also present in the mercury um and neon and provided with a yellow filter vapor spectrum is produced by a mercury vapor produce a substantially pure yellow light. The lamp which is a more eflicient lamp than similar starting and operating voltage of electric dislamp devices filled with helium or with a mixture ml charge lamps having such gaseousfilling is higher of helium and neon. The lamp device made in 65 than those of lamps having a neon filling or a' accordance with the present invention emits a mercury filling. The object of the present inpure or typical yellow light from all parts thereof. vention is to provide a gaseous electric discharge In the drawing accompanying and forming part lamp device for the production of pure yellow of this specification an embodiment of the invenlight which has a lower starting and operating tion is shown in a side elevational, partly sec- (0 voltage and is more efllcient than prior devices. tionalview. Still further objects, and advantages attaching Referring to the drawing the new and novel to the device and its use and operation will be gaseous electric discharge device for producing apparent to those skilled in the art'from .the typical yellow light comprisesatubular container following particular description. 1 made of an opal or matte glass. Said con- 75 In accordance with this object the invention tainer 1 has a gaseous atmosphere therein comcomprises an electric discharge lamp device havp s u y vap r d p a mixing a gaseous atmosphere therein comprising ture of a starting rare gas, such as argon or mercury vapor, a yellow filter in operative rela- 118011, a ercury vapor. The mercury D0 12 tion to said lamp device and a translucent glass is the u c Of t m y ap r. When the 80 interposed between said lamp device and the eye amp d e i a d into p a on the elecof an observer. Color filters have been used in tric discharge therein is conducted by the rare conjunction with electric discharge lamp devices as until the heat of the discharge vaporizes the to produce light of various colors, for example, e c y D 0 The pectrum of the light yellow green or brown filters'have been used in emitted by the mercury. vapor discharge pre- 86 conjunction with mercury vapor filled lamp dedominates over the spectrum ofthe light emitted vices t produce a green olo d light, Yenow by the rare gas during the operation of the defilters used in conjunction with such lamp device. Current leads 5 and 6 having electrodes 7 vices have not been successful in the production and 8 m nted h re n r spe ively are sealed 1 pure or typical yellow light inc th nd parts into the stems 3 and 4 respectively of said conof the lamp, in the region of the electrodes, emits m ne Said electrodes '7 and 8 are of the a strong green colored light which the usual yel- 'slntered, mixed metal and oxide type and are eleclow filters cannot successfully screen out. The tron emitting when heated. Base members 9 and und ir d green rays can be screened out by S 10 are provided at the ends of said container 1. 0 cal ed P Y ow fi s bill; the light D A yellow filter 11 is placed over the container duced s then IlOt 91 8 but a brown 1. completely covering said container 1 between light of low intensity-' the bases 9 and 10. Said filter 11 is of glass or f gfsgi 2; gs z ggg gizf ggfig other suitable material. A lamp device having 45 screens out the objectionable green light so that tlypmal a mercury vapor lamp provided with normal While I have shown and described and have t yellow filter and an opal glass con amer for ex pointed out in the annexed claims certain novel 1 ell 1i ht from all arts s gg g igs g g for features of the invention, it will be understood that various omissions, substitutions and changes 60 fim gi s ifo t w rz pg ri g gfig in the forms and details of the device illustrated visible spectrum than in the long wave part and in its use and operation may be made by thereof and that part of the green light which those skilled in the art without departingfrom is not affected by the yellow filter is cut oil by the broad spirit and scope of the invention, for 55 the opal glass. The arrangement of the yellow exampidgiifierent types of electrodes such as cold sheet metal electrodes, liquid electrodes, or heated electrodes can be used in place of those shown and described, when desired.

What I claim as new and desire to secure by Letters Patent of the United States is:

In combination a gaseous electricdischarge lamp comprising a translucent container, elec- MARCELLO PIRANI. 

